A podcast that I like is Literature and History, by Doug Metzger. It's about the history of English literature! He covers stuff chronologically, starting off with cuneiform, since you can't talk about literature without talking about the birth of writing. I've just finished up the season where he talks about Roman literature! It's very cool, he has his PhD in American literature of the 1800s (I think, don't quote me) and it is peer-reviewed! Amazing educational podcast.